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Intangible assets and goodwill - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Cost | $ 162,292 | $ 168,522
Accumulated amortization | 57,176 | 53,609
Net book value | 105,116 | 114,913
Power sales contracts |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 58,112 | 57,943
Accumulated amortization | 43,118 | 41,184
Net book value | 14,994 | 16,759
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 78,140 | 83,342
Accumulated amortization | 12,337 | 10,967
Net book value | 65,803 | 72,375
Interconnection agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 15,072 | 15,028
Accumulated amortization | 1,721 | 1,458
Net book value | 13,351 | 13,570
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 10,968 | 12,209
Accumulated amortization | 0 | 0
Net book value | $ 10,968 | $ 12,209

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